ATE77190T1 - OPERATION CONTROL SYSTEM FOR ONE OR MORE DEVICES. - Google Patents

Abstract

The system allows to control the operation of one or more apparatus or plants, each one having at least a telephone set coupled to the telephone system. The system comprises: one or more peripheral control units, each one coupled to a relevant apparatus or plant to be controlled, and coupled to one or more electrical sensors, in turn coupled to the controlled apparatus or plant, each one of the sensors providing at its output electrical data signals indicative of controlled parameters, and which may be coupled to the telephone line connected to a the telephone set located in the same building where the apparatus or plant to be controlled is located; a central control unit, which may be coupled to the telephone line, and apt to send signals to and receive signals from each peripheral control unit. Each peripheral control unit includes switching means coupled to the telephone set and to the telephone line and apt to: a) ascertain whether by means of said telephone line calling pulses are received at least during two subsequent time periods (T1, T2) starting from the start of the first calling pulse received; b) decouple for a predetermined period of time starting from the start of the first calling pulse the telephone set from the telephone line; c) in the case that during the second of said time periods T2 no calling pulses are received, decouple said telephone set from the line and allow that the signals from the peripheral control unit are sent in the line, and d) restore the initial situation of wiring between said telephone line, said telephone set and said peripheral unit when the transmission of information between peripheral and central units by means of the telephone line is over.